sim_events.cc revision 3144 
1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Nathan Binkert
29 */
30
31#include <string>
32
33#include "base/callback.hh"
34#include "base/hostinfo.hh"
35#include "sim/eventq.hh"
36#include "sim/param.hh"
37#include "sim/sim_events.hh"
38#include "sim/sim_exit.hh"
39#include "sim/startup.hh"
40#include "sim/stats.hh"
41
42using namespace std;
43
44//
45// handle termination event
46//
47void
48SimLoopExitEvent::process()
49{
50    // if this got scheduled on a different queue (e.g. the committed
51    // instruction queue) then make a corresponding event on the main
52    // queue.
53    if (theQueue() != &mainEventQueue) {
54        exitSimLoop(cause, code);
55        delete this;
56    }
57
58    // otherwise do nothing... the IsExitEvent flag takes care of
59    // exiting the simulation loop and returning this object to Python
60
61    // but if you are doing this on intervals, don't forget to make another
62    if (repeat) {
63        schedule(curTick + repeat);
64    }
65}
66
67
68const char *
69SimLoopExitEvent::description()
70{
71    return "simulation loop exit";
72}
73
74SimLoopExitEvent *
75schedExitSimLoop(const std::string &message, Tick when, Tick repeat,
76                 EventQueue *q, int exit_code)
77{
78    if (q == NULL)
79        q = &mainEventQueue;
80
81    return new SimLoopExitEvent(q, when, repeat, message, exit_code);
82}
83
84void
85exitSimLoop(const std::string &message, int exit_code)
86{
87    schedExitSimLoop(message, curTick, 0, NULL, exit_code);
88}
89
90void
91CountedDrainEvent::process()
92{
93    if (--count == 0) {
94        exitSimLoop("Finished drain");
95    }
96}
97
98//
99// constructor: automatically schedules at specified time
100//
101CountedExitEvent::CountedExitEvent(EventQueue *q, const std::string &_cause,
102                                   Tick _when, int &_downCounter)
103    : Event(q, Sim_Exit_Pri),
104      cause(_cause),
105      downCounter(_downCounter)
106{
107    // catch stupid mistakes
108    assert(downCounter > 0);
109
110    schedule(_when);
111}
112
113
114//
115// handle termination event
116//
117void
118CountedExitEvent::process()
119{
120    if (--downCounter == 0) {
121        exitSimLoop(cause, 0);
122    }
123}
124
125
126const char *
127CountedExitEvent::description()
128{
129    return "counted exit";
130}
131
132#ifdef CHECK_SWAP_CYCLES
133new CheckSwapEvent(&mainEventQueue, CHECK_SWAP_CYCLES);
134#endif
135
136void
137CheckSwapEvent::process()
138{
139    /*  Check the amount of free swap space  */
140    long swap;
141
142    /*  returns free swap in KBytes  */
143    swap = procInfo("/proc/meminfo", "SwapFree:");
144
145    if (swap < 1000)
146        ccprintf(cerr, "\a\a\aWarning! Swap space is low (%d)\n", swap);
147
148    if (swap < 100) {
149        cerr << "\a\aAborting Simulation! Inadequate swap space!\n\n";
150        exitSimLoop("Lack of swap space");
151    }
152
153    schedule(curTick + interval);
154}
155
156const char *
157CheckSwapEvent::description()
158{
159    return "check swap";
160}
161
162//
163// handle progress event: print message and reschedule
164//
165void
166ProgressEvent::process()
167{
168    DPRINTFN("ProgressEvent\n");
169    // reschedule for next interval
170    schedule(curTick + interval);
171}
172
173
174const char *
175ProgressEvent::description()
176{
177    return "progress message";
178}
179